Can You Paint your Aluminium or Vinyl Trims?

Apply painter's tape to seal off the areas that do not need painting.

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Brush a thin coat of the chosen primer.

Allow the primer to dry thoroughly.

Begin painting the vinyl trim. Use even strokes for a thin first coat, and pay attention to the edges!

Wait for the first coat to dry completely.

Apply as many coats as necessary to achieve a polished and perfect finish.

How to Paint Aluminum -- and Keep It Painted

Fill a container halfway to three-quarters with phosphoric acid. Ensure it is deep enough for soaking the part without requiring you to submerge your hand fully to retrieve it.

Carefully drop the freshly sanded part into the acid, avoiding any skin contact. While relatively mild, it can still cause burns.

Let the part soak for about 30 minutes, flipping it occasionally to ensure thorough coverage. During this time, distract yourself—perhaps by reading the news—as the soaking process isn’t time-sensitive, but 30 minutes tends to yield good results.

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The image depicts my well-used phosphoric acid container, which changes color with each use due to chemical reactions. The residue on the sides of the container is tough to clean out, which is another reason I don't recommend repurposing it for other uses. I merely keep it filled with phosphoric acid for various applications; it’s also effective for rust removal, but that’s a different topic. The coffee cup in the picture was a thoughtful gift from my daughter, who excels in rocket science—sometimes a bit of bragging is warranted!

The second image illustrates the reaction occurring in the solution, producing white foam from the aluminum’s surface.

The third image shows the part emerging from the solution, exhibiting an unusual sheen and a slightly pink hue.

The final image reveals the residue settling at the bottom of the rinse water, which likely consists of similar particles from the etching process. It's intriguing!

I'm no chemist and lack the motivation to conduct in-depth research, so take this explanation with caution. I suspect phosphoric acid transforms aluminum or aluminum oxide into a compound that promotes paint adhesion. This is merely a hypothesis. However, my experiments indicate that including this etching step significantly improves paint adherence compared to skipping it. This suggests that this step is crucial, possibly categorized under "conversion coating."

Once the part completes soaking, transfer it to a clean water container and soak for another 30 minutes. You’ll notice various residues dissolving in the water. Afterward, remove the part and rinse it thoroughly with running water. Gently dry the surface with clean paper towels. The aluminum should appear with a dull whitish-gray surface and a subtle pink tint, consistent and even across the area. Allow it to air dry thoroughly, perhaps using a fan to facilitate this process. Ideally, don’t delay painting it; we’ve invested considerable effort in cleaning and removing oxide, so letting it oxidize again would be counterproductive. I recommend painting within a few hours, or at most a day.

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